深厚軟土深長(zhǎng)樁基壓縮層厚度試驗(yàn)研究與沉降數(shù)值模擬.pdf

1、西南交通大學(xué)碩士學(xué)位論文深厚軟土深長(zhǎng)樁基壓縮層厚度試驗(yàn)研究與沉降數(shù)值模擬姓名：朱林申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：巖土工程指導(dǎo)教師：馬建林201205西南交通大學(xué)碩士研究生學(xué)位論文第lI頁(yè)AbstractThesettlementcalculationmethodforgrouppilesinexistentspecificationsismainlybasedonlayerwisesummationmethod，buttheresultisa

2、lwaysoverconservedForlackingincompressivelayerthicknessfielddataforgrouppilesespeciallyforlongfrictionpilesinthicksoftsoil，andtherearemorethanonecriterionforcompressivelayerthicknesscalculation，intensivestudyisneededtode

3、terminewhichcriterionisbetterforlongfiictiongrouppilesinthicksoftsoilThicknessofcompressivelayerisanimportantparameterforsettlementcalculationandasignificantbasisforfoundationsettlementanddeformation，SOitsfieldtesthasgre

4、atrealisticmeaninginpracticalen百neeringInaddition，compressionmodulusisanmajorfactorforsettlementcalculation，butcompressionmodulusprovidedbygeotechnicaltestisusuallyunderthepressureof100～200kPathoughit’Salwayssuitablefors

5、hallowfoundationwithasmallinaccuracybuttheinaccuracycoMPared、Ⅳimthefielddataismuchbiggerforcalculationoflongfrictionpilesinthicksoftsoil，sometimestheinaccuracywillamountsev蹦altimesofthefielddatawhichmakesthetheoreticalca

6、lculationandnumeralsimulationoffoundationsettlementunrealisticInviewoftheabove，singlepointsettlementgaugeandliquidlevelsettlementgaugeareadoptedtomonitorthecompressivelayerthicknessandsettlementoflongfrictiongrouppilesin

7、thicksoftsoil，whichmakesthesinglepointsettlementgaugeavoidedanchoringinbedrockorstablesoillayerandalsothecompressivelayerthicknessandthesettlementofthegrouppilesareobtainedAnewformulaforcompressionmodulusmodificationalon

8、gthicksoftsoilisputforwardinthiste甌basedontheformulacoMParativeanalysisofgrouppilessettlementbyexistentnationalspecificationsiscarriedoutandcombined謝tlllO％‘methodofcontrolstress”。whichusedtocontrolcompressivelayerthickne

9、ss，isadoptedtocalculatesettlementoflongfrictiongrouppilesinthicksoftsoilThroughcoMParison、析Ⅱlthefielddatasettlementvaluebythismethodisclosetothemeasuredvalue，whichprovestheapplicabilityincalculatingsettlementinthicksofts

10、oilBasedonmodifiedcompressionmodulusEllcompressionmodulus乓o_I川providedbygeotechnicaltestunderthepressureof100—200kPacompressivelayerthicknessby“methodofcontrolstress”，experientialcompressivelayerthickness，settlementnumer

11、alsimulationoflongfiictiongrouppilesinthicksoftsoilbyPlaxis3DFoundationfiniteelementsoftwareiscarriedout，whichprovesthatsettlementnumeralsimulationbasedonmodifiedcompressionmodulusE∥compressivelayerthicknessby‘‘methodofc